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In page German Empire:

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The creation of the Empire under Prussian leadership was a victory for the concept of Kleindeutschland (Smaller Germany) over the Großdeutschland concept. This meant that Austria-Hungary, a multi-ethnic Empire with a considerable German-speaking population, would remain outside of the German nation state. Bismarck's policy was to pursue a solution diplomatically.[citation needed] The effective alliance between Germany and Austria played a major role in Germany's decision to enter World War I in 1914.[citation needed]